If you purchased Overlord via Gumroad, your license key will be available in your Gumroad Library under the Overlord product page. Official Download Link
If you have a legitimate key but the plugin says "Invalid License," try these solutions: overlord plugin license key link
When you purchase Overlord, the license key is sent immediately to the email address used at checkout. Search your inbox for "Battle Axe" or "Overlord." If you purchased Overlord via Gumroad, your license